Fixes issue 73: Secondary index - multiple values:
Too keep backward compatibility indexes with only one value will still point to a string but indexes with multiple values will instead have an array of strings.

Since 1.0 stable
Features:
Issue 10: Automatic retry implemented and set to 1 retry by default
Issue 50: vClock now gets read from object if not present in input, making vclock easier to work with.
Issue 54: Conflict resolver can now be set on a bucket or passed along to the get function, which can make conflict resolving a lot easier.
Fixes:
Issue 55: Implemented missing getter for last modified on object.

New features:
Issue 50: vClock now gets read from object if not present in input, making vclock easier to work with.
Issue 54: Conflict resolver can now be set on a bucket or passed along to the get function, which can make conflict resolving a lot easier.
Issue 10: Automatic retry implemented and set to 1 retry by default
Fixes:
Issue 55: Implemented missing getter for last modified on object.